I was thinking about this, -67 Black Panther.
Gorries offered both the 327 and 427 V-8 engine options for their Panthers. The basic 327 had 210 HP. The 275HP L30 engine, at 10:1 compression made 355FT pounds of torque at 3,200 RPM. The optional blueprinted 427 - 435HP, ZL1 engine with its neck snapping 460FT pounds of torque at 4,000 RPM put some real teeth in the Panthers. At 12:1 compression, the ZL1 engine with its large 925 CFM 4-barrel carburetor proved to be a formal opponent for the Shelby GT-500 Mustangs, which carried the 428 big-block Ford engine, but only developed 355HP in 1967.
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